KDP Spine Width Calculator
Enter your page count and paper type — get the exact spine width Amazon KDP expects, in inches, millimeters and pixels at 300 DPI.
KDP spine width = page count × paper thickness (white 0.002252 in/page, cream 0.0025 in/page). Full-wrap cover width = 2 × trim width + spine + 0.25 in bleed; the calculator on this page returns all three values instantly.
Full-wrap cover width (6×9 in, 0.125" bleed):
How the formula works
KDP multiplies your total page count by a per-page thickness: white paper 0.002252" per page, cream 0.0025". Hardcover adds 0.16" for the board.
| White | Cream | |
|---|---|---|
| in / page | 0.002252 | 0.0025 |
| mm / page | 0.0572 | 0.0635 |
Download the KDP Cover Checklist (PDF)
The 20-point final check before you publish: sizing, typography, genre signal and the KDP upload. Print it and keep it beside your cover.
Email is optional — the PDF downloads either way. Your address is only used for new template and guide announcements; unsubscribe anytime.What is the KDP spine formula?
Spine = page count × paper thickness (white 0.002252", cream 0.0025"). Hardcover adds 0.16".
When can I put text on the spine?
KDP requires at least 0.25" of spine — roughly 100+ pages. Below that, leave the spine empty.
Does the page count include front matter?
Yes. Use the total page count of your final interior PDF, including title page, copyright and blanks.
Embed this calculator on your site
Copy the two lines below — the calculator works as-is in your blog post, with a small Veritas Canvas credit underneath.
<div data-veritas-spine data-lang="en"></div> <script src="https://www.veritascanvas.com/veritas-spine-widget.js" defer></script>
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